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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6210) FS: Node reservations can interfere with preemption
Date Wed, 22 Feb 2017 18:19:44 GMT

    [ https://issues.apache.org/jira/browse/YARN-6210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15878912#comment-15878912
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Karthik Kambatla commented on YARN-6210:
----------------------------------------

bq. FSAppAttempt.isStarved(Resource usage, Resource share): probably a bad name. It doesn't
have anything to do with starving. It's a comparator.
I agree it is not the best name, but I couldn't come up with a better name that will not be
used incorrectly in the future. I am happy to accommodate any valid suggestions. 

bq. Nope, the assignment-at-lower-priority assert is retained. The original test also had
an assert to test the reservation itself:
This test deals in fewer containers. There is a check for reservation succeeding and subsequently
allocation succeeding. Since the behavior changed on when reservations are allowed, the app
cannot reserve more than one container.


> FS: Node reservations can interfere with preemption
> ---------------------------------------------------
>
>                 Key: YARN-6210
>                 URL: https://issues.apache.org/jira/browse/YARN-6210
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>    Affects Versions: 2.9.0
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>         Attachments: YARN-6210.1.patch, YARN-6210.2.patch, YARN-6210.3.patch
>
>
> Today, on a saturated cluster, apps with pending demand reserve nodes. A new app might
not be able to preempt resources because these nodes are already reserved. This can be reproduced
by the example in YARN-6151. 
> Since node reservations are to prevent starvation of apps requesting large containers,
triggering these reservations only on starved applications would avoid this situation. 



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